A series of 46 3-phenyloctahydropyrimido[1,2-a]-s–triazinederivatives were synthesized. This synthesis was performed via iminodimethylation of dialkylated 2-aminopyrimidinedione synthons by substituted primary arylamines. In vitro pharmacological evaluation of these compounds is reported. One of them exhibited antifungal activity against Microsporum canis (10−65010−5 mol/L), and another showed affinity